Hand crimper



Oct. 23, 1951 M. G. LOVINGGOOD 2,572,738

HAND CRIMPER Filed April 29, 1949 Fig.

-m 36 40 42 L 0 @fll llll-llllmlllbiifil Patented Oct. 23, 1951 UNITEDSTATES PATENT OFFICE 1 2,572,738 I 7 iv I 4 HAND CREIPER- Martin G.Lovinggood, Odessa, Tex.

Application April 29, 1949, Serial No. 90,510

1 Claim.

This invention relates to a hand crimper especially designed for use inattaching a sheet metal take-off stub to a main duct for airconditioning and. similar purposes.

In air conditioning and. similar apparatus, it becomes necessary toinsert a sheet metal takeoff stub in a hole provided in a main air duct.The stub must be crimped down firmly all around inside of the main ductto hold the take-off stub firmly in place and to make it airtight. Atpresent, the take-off stub is crimped to the main duct by holding asmall dolly against a shoulder on the outside of the main duct andreaching inside and hammering the take-01f stub down. The primary objectof this invention is to provide a tool which will eliminate the time,trouble and efiort expended in the present installation method.

Another object of the invention is to provide a hand crimper for use inattaching a sheet metal take-off stub to a main duct comprising a firstlever, means for receiving the wall of the stub in said lever, a fixedjaw carried by said lever adjacent said means, a second lever pivotedintermediate the ends of said first lever, a movable jaw, and linkageconnected to said second lever for urging said movable jaw towards andaway from said fixed jaw.

These, together with various ancillary objects and features of theinvention which will later become apparent as the following descriptionproceeds, are attained by the device, a preferred embodiment of whichhas been illustrated by way of example only in the accompanyingdrawings, wherein:

Figure 1 is a side elevational view of the device illustrating its usein crimping a take-off stub to a main duct;

Figure 2 is a side elevational view of the device shown in openposition;

Figure 3 is a bottom plan view of the device; and

Figure 4 is a top plan view of the movable jaw.

Specific reference is now made to the drawings. In the several views inthe accompanying drawings and in the following specification similarreference characters indicate corresponding elements throughout.

Indicated at I is a main air duct having an aperture I2 adapted toreceive a sheet metal take-off stub M. The stub includes an annularshoulder [6 adapted to abut the duct II]. It becomes necessary to crimpthe inner ends I8 against the inner surface of the duct H) to secure thestub to the duct, and the tool 20 has been provided for this purpose.

The tool includes a first lever 22 having a handle 24 and an elongatedhead 26. The head 26 includes an elongated slot 28 which is open at itsforward end as at 30. As will be seen clearly in Fig. 1, the slot isadapted to receive the wall of the stub 14. Carried by the head adjacentthe open end of the slot is a laterally extending fixed jaw 32 adaptedto engage the shouder l6.

Pivoted to the first lever 22 as at 34 is a second lever 36 which, asshown in Fig. 3, straddles the head 26 of the first lever. The secondlever also includes a handle 38. Pivoted as at 40 to the upper end ofthe lever 36 is a link 42, which at its free end is pivotally secured asat 44 to a pair of short arms 46 that are in turn pivoted as at 48 tothe head 26. The arms 46 carry a laterally extending movable jaw 50.

In use, the crimper 20 is slipped into the stub l4 so that the wallthereof is received in the slot 28, the fixed jaw 32 abutting theshoulder I 6. The handles 24 and 38 are spread apart, as shown in Figure2, to move the jaw 5|! away from the jaw 32. In this position the jaw 50engages the inner end l8 of the stub. When the handles are urgedtogether, the jaw 50 moves towards the jaw 32, as shown in Fig. l,crimping the end [8 against the inner surface of the main duct l0.

In view of the foregoing description taken in conjunction with theaccompanying drawings it is believed that a clear understanding of thedevice will be quite apparent to those skilled in this art. A moredetailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shownand described a preferred embodiment of the invention the same issusceptible to certain changes fully comprehended by the spirit of theinvention as herein described and the scope of the appended claim.

Having described the invention, what is claimed as new is:

A hand crimper for use in attaching a sheet metal take-off stub to amain duct comprising a first lever having an elongated head and a slotextending longitudinally through substantially the entire length of saidhead and opening through the free end thereof, said slot being adaptedto receive the annular wall of a take-off stub, a fixed jaw at the freeend of said head and extending laterally thereof, a second lever pivotedintermediate its ends to said first lever, a first link pivotedintermediate its ends to the free end of said head, a second jaw at oneend of said first 3 link and opposite said fixed jaw, and a second linkNumber terminally pivoted to said second lever and to the 805,651 otherend of said first link. 902,570 MARTIN G. LOVINGGOOD. 1,151,772 51,219,726 REFERENCES CITED 1 54 The following references are of recordin the 2,126,225 file of this patent:

.UNITED STATES PATENTS 10 Number Number: Name Date? 201,361

630,387 Maxwell Aug. 8, 1899 Name Date Lang Nov. 28, 1905 Ellis Nov. 3,1908 Erickson Aug. 31, 1915 Gray Mar. 20, 1917 Carlson June 9, 1925Simons Aug. 9, 1938 FOREIGN PATENTS Country; Date Great Britaint. 1 Aug:2, 1923

